As an ambulance with its siren on approaches a stationary listener, the pitch heard is:

  1. higher than the actual siren frequency
  2. lower than the actual frequency
  3. zero
  4. the same as the actual frequency
Answer

A) higher than the actual siren frequency

Wavefronts are bunched up ahead of the source. SLO P-11-D-02 · Understanding

Physics MCQ · More Wave Intensity and the Doppler Effect MCQs · Practise